Cromer



(No Moder.

G. GAVIN & L. W. OROMER.

BIT BRAOE.

No. 366,826. Patented July 19, 1887.

WITNESSES INVBNTOR i w offiwmu BY u Q ATTGRNEYS.

UNITED STATES PATENT OEEicE.

GEORGE GAVIN AND LZUVRENGE VASHINGTON CROMER, OF EUREKA,

NEVADA.

BlT-BRAC E.

SPEQIFICATION forming part of Letters Patent No. 366,826, dated July 19,1887. Application filed July '21, 1886. Serial No. 209,021. (No model.)

To rtZZ whom, it may concern.-

Be it known that we, GEORGE GAVIN and LAWRENCE WAsnINe'roN CROMER, of Enreka, in the county of Eureka and State of Nevada, have invented a newand Improved Bit-Brace, of which the following is a full, clear, andexact description.

Our invention consists in the construction and arrangement of parts, aswill be hereinafter fully described and claimed.

Reference is to be hadto the accompanying drawings, forminga part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a front elevation of our bit-stock as applied to aratchet-brace, with the bit locked in position by the sliding bolts Fig.2 is ahorizontal section thereof, and Fig. 3 a vertical transversesection of the same. Fig. 4 is a front elevation of our bitstock as usedwith the ordinary brace.

A represents a portion of a brace, and B a bit-stock, usually madecylindrical in form and secured to the brace in the ordinary manner. Atthe lower end, upon'one side of the bitstock B and extending through thesocket thereof, is cut a T-shaped slot, (),the vertical portion of whichextends through the lower edge ofthe bit-stocl;,dividing the same.

The socket of the bit-stock is provided with a cylindrical bore adaptedto receive a similar cylindrieally-shaped bitshank, D, provided abovethe shoulder thereof with a pin, a, which when the bit-shank is inposition within the socket of the bit-stock engages either end, asdesired, of the horizontal arm of the T- slot 0.

A vertical groove, 1), is cut in the face of the bit-stock B from adistance above the T- shaped slot 0, merging into its horizontal armopposite the vertical arm of said slot O, the width of the groove 1)being greater than that of the said T-shaped slot. Into the groove bthus formed a bolt, E, provided with a central slot, 6, and an upperthumb-hold, e, is adapted to slide down to a position against the underside of the horizontal arm of the slot 0, dividing the said arm andretaining the pin (6 of the bit-shank D in one of the divisions thusformed, as shown in Fig. 1. The

bolt E is securely held in position by a set screw, d,whieh enters theslote therein, and is screwed down to a bearing upon the sides of thesaid slot into the bitstock B. The pin a is thus held securely in eitherdivision of the horizontal arm of the T-slot O, and as the bolt E formsa cap for the verticalarm ot' the said slot the pin a cannot entertherein until the bolt E is slid to its upward position, which is inline with the upper side of the horizontal arm of the said slot 0.

It is only necessary to employ the bolt E when the bit-stock is attachedto a ratchet brace. The pin a is then bolted thereby, as described, ineither the right or left division of the horizontal arm of the T-shapedslot 0, to accommodate the desired movement of the ratchet.

The bit-stock is complete without the sliding bolt E for use withordinary braces, as in boring a hole, for instance, the pin a of thebit-shank D,which is entered through the vertical arm of the slot 0,will bear against the left-hand end of the horizontal arm thereof, andas the motion of the brace is reversed to withdraw the anger the pinfinds its bearing against the opposite or right-hand end of the saidhorizontal arm ofthe said slot. Therefore in this connection a lock isnot needed.

The construction of our bit-stock, also that of the bit-shank, is mostsimple in every particular, and does not contain a single element liableto displacement or breakage, and to gether they operate in as perfectmanner as any socket or hit heretofore used, while the cost ofconstruction is reduced to a minimum figure.

The operation is briefly as follows: Vhen an ordinary brace is employed,the bit shank is mounted into the socket of the bitstoek, the pin orstop a thereon passing up through the vertical arm of the T-slot G toengagement with either end of its horizontal arm, as requiredforexample, to drive a screw upon the left to withdrawit upon the right.Vhen employed with a ratchet-brace, the additional operation is had ofsliding the boltE down to its bearing upon the under side of thehorizontal arm of the slot 0, in order to lock the pin a of thebit-shank D in either the right or ICO left division of the T-shapedslot 0, as the nature of the work may demand. We do not limit theapplication of our invention to hitstocks and bits, as shown, as thesame maybe 5 otherwise applied-as, for instance, to angers andauger-handles.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is 1o 1. The combinatiomwith the bit-stockhaving a Vertical bit-socket, and an angular slot leading from the endof the stock and communicating with its socket, of aslotteclverticallysliding bolt adapted to slide over the vertical '15 arm ofsaid slot to close the same andpro- GEORGE olvni. laAwRENCE WASHINGTONCROMER.

Witnesses: A. A. ANDRE,

J. A. LAWRENCE.

